compiled and developed version of nginx, here take the nginx source image on github as an example

git clone https://github.com/nginx/nginx.git
cd nginx
CFLAGS="-g -O0" ./auto/configure --with-debug --prefix=../etc
make
make install

modify the nginx.conf configuration file to listen on port 8080 and enable development mode

worker_processes  1;
+master_process off;
+daemon off;

http {
   server {
       -listen       80;
       +listen       8080;

run nginx at this time, and then open http://localhost:8080/ in a browser to confirm that the website is running

../etc/sbin/nginx

finally rerun nginx using gdb

xxx/nginx > gdb ../etc/sbin/nginx
Reading symbols from ../etc/sbin/nginx...done.

(gdb) b main
Breakpoint 1 at 0xNNNN: file src/core/nginx.c, line 196.

(gdb) r
Starting program: ../etc/sbin/nginx
[Thread debugging using libthread_db enabled]
Using host libthread_db library "xxx/lib/libthread_db.so.1".

(gdb) b main
Breakpoint 1, main (argc=1, argv=0xNNNN) at src/core/nginx.c:196

(gdb) list main
191    static char **ngx_os_environ;
192
193
194    int ngx_cdecl
195    main(int argc, char *const *argv)
196    {
197        ngx_buf_t        *b;
198        ngx_log_t        *log;
199        ngx_uint_t        i;
200        ngx_cycle_t      *cycle, init_cycle;

(gdb) print argc
$1 = 1

(gdb) print argv[0]
$2 = 0xNNNN "xxx/etc/sbin/nginx"

gdb prompt

1. use help or help xxx to get command help.
2. to add a function breakpoint, you can directly enter b < function name > without having to find out the file location of the function. The same goes for list .

1. ide/installing-nginx/installing-nginx-open-source/-sharpsources" rel=" nofollow noreferrer "> https://docs.nginx.com/nginx/.
2. https://nginx.org/en/docs/ngx.